Improvement in pipe-drilling machines



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E. tented Nov. 2, 1875.

F. GRINNELL. PIPE-DRILLING MACHIN No.169,354.-. Pa.

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Patented Nov 2,1875

F GRINNELL PIPE-DRILLING MACHINE.

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UNITED STATES PATENT ,Qrrron.

FREDERICK GRINNELL, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN PIPE-DRILLING MACHINES.

Specification forming part of Letters Patent No. 169,354, dated November2, 1875; application filed June 15,1875.

To all whom it may concern:

Be it known that I, FREDERICK GRINNELL, of Providence, in the State ofRhode Island, have invented certain new and useful Improvements relatingto Machinery for Drilling Pipes, of which the following is aspecification:

The machine drills at the same time a hole at one point with a largedrill through something more than half the thickness of the pipe, and atanother point drills a smaller hole,

I which continues the large hole bored partially through at a previousoperation, and thus makes a small hole extending through to the interiorof the pipe. It also provides for marking with a prick-punch at certainearly stages of the operation, clamping the pipe strongly and liberatingit rapidly at will, sustaining the smaller drill laterally against anydisturbing force, and also guiding it very accurately into the bottom ofthe partial hole previously bored.

The following is a description of what I consider the best means ofcarrying out the invention: The accompanying drawings form a part ofthis specification.

Figure 1 is an end view of the parts connected with the drill for boringthe small hole. Fig. 2 is an end view of certain portions with across-section through the prick-punch and the adjacent parts. Fig. 3 isa front view of l the entire main portions of the machine. Fig.

1 is a section, showing on a larger scale the guide surrounding thesmall drill.

Similar letters of reference indicate like parts in all the figures.

A is a fixed frame of cast-iron or other suitv able material. It isformed with ways A A upon which may be adjusted carriages to support thearbors of the drills, and the bearings of theprick-punch, withholding-bolts, (not represented,) or other ordinary means for adjustingthem firmly in position thereon,as may be required BracketsA support ashaft, B, formed with an arm, B which is connected by arod, 0, having anadjustment, 0, to a treadle (not represented. This arm B is elevated bymeans of a weighted cord, D, running over a pulley, E. The other arms Bfixed on the shaft B, are adapted to press firmly against the tube,

represented in'dotted lines in Fig. 1, Whenever the treadle isdepressed. The pipe is supported upon rollers Gr turning upon fixedstuds g. These rollers G should be exchanged when a different size oftube is to be treated, the exchanges being made so as to hold the axesof all sizes of tubes at the same elevation, just level with the centersof the arbors of the drills. v

The pipe is introduced at one end of the machine when the pressure ofthe treadle is relaxed. I In this condition the weighted cord D elevatesthe arm 13 and throws outward the arms B so that it is easy to movealong the pipe supported on the rollers G, and with the overhanging endssupported on additional rollers (not represented) at the ends of themachine. The pipe is alternately fed forward, griped, and drilled, thedrilling being effected simultaneously at'two points.

Figs. 1 and 1 represent the smaller drill and the parts which operateand guide it. H is the arbor, provided with a pulley, H, receiving abelt driven from some shaft (not represented.) It is supported inbearings F F on the adjustable carriage F, and carries a drill, h, whichmay be one of the most delicate twist-drills. A shaft, N, extendslongitudinally on the machine. Fig. 1 shows a support therefor on thecarriage F, and there is a corresponding support on each of the othercarriages. A hand-lever, N fixed on the shaft N gives a rocking Inotionthereto when desired. A rod, H connects from the lever N to the shaft orarbor H. When the hand of the operator is applied to the lever N and itis moved forward, thereby rocking the shaft N, it, by means of the rodor link B moves forward the shaft H, and consequently the drill h. Acoiled spring, I, moves these parts back to their first position whenthe handle N f is released.

The drill h, when moving forward,is sur rounded by a bushing, J j, ofhardened steel," v

having a funnel-shaped aperture, adapted to receive the drill.This'bushing is threaded through a standard,F fixed adjustably on i thecarriage F. ()n the outer face of this bushingis a projection, j, whichis exactly concentric to the small hole through which the drill h plays,and is formed of a contour cortween the holes.

responding to the partial hole which has been previously drilled in thetube. The tube is fed forward by hand, and the exactly right position isdetermined by the attendant, who

'fits or matches the partially-drilled hole on the ltolan arm,:N sothattherockingof theshaft 'N moves forward the large drill k at the sametime that it moves forward the small drill h. The drill k'is held firmlyby a nut, which is formed with a large hand-wheel, L, serving both asafly-wheel and as a convenient means of tightening the hold upon thedrill. The drill is held in the arbor by screwing the nut. upon ataperendof the arbor, which is sawed across, or otherwise-split, to allow theforcible contraction of the drill .by the action of the nut. The drillis purposely made short, and is very rigidly held'to the arbor. Thehandwheel'L, rotating at 'a high velocity close to the point where thelargedrill k isacting, serves an importantfunction by steadying the saiddrill to resist any disturbing effect induced by inequalities in thehardness of the iron. Thecarri-age 0, which supports the shaft of thelarge drill,is adjusted at F just a. proper distance from the carriageE, which supports the small drill, to correspondwith two or some othernumber of intervals be P is a prick-punch, mounted upon a housing, Q,and held up by a coiled spring, R. The housing Q is supported on acarriage,*S, which: is adjusted insuch position that the horizontaldistance between the prickpunch P-and the large shaft K is just equal tothe distance between two --adjacent holes in thepipes.

I will-describe the operation minutely. Each pipe to be drilled isintroduced from 1 the left, and the first operation after relaxing thetreadle is to draw the pipe forward until its end is. a little past theaxis of thelarge drill is. Then, after depressing the treadle andgripin'g the pipe firmly' by the arms B the lever N l is drawn forwardby the attendant, andthe large hole is thus drilled partially throughthe pipe, an operation which may be termed countersinking. 1

Simultaneously with this operation, or immediately before or after it, ablow is struck by the attendant with a Wrench -or other suitable objectupon the head'ofthe prick-punch P, causing a distinct indentation orprick-punch mark on the pipe. Now, after relaxing the treadle, and thusreleasing the hold of the-,griping-arms B the pipe is moved by theattendant forward one space, andiis turned partially on its axis, so asto bring the punch-mark opposite the large drill.

sionfor operating the prick-punch. Again,

the gripe is relaxed and the pipe moved forward, and the prick-punchmark last made is availed of to determine the place to be presented tothe large drill k, which done, the lever N is again operated, and thispoint is countersunk. Now, on again relaxing the 1holdandoncemoreomoving,forwardth'e pipexw m, it should be turned more thanbefore, so as to complete a revolution. Rightly conducted, this fourthmovement brings the first partially drilled or countersunk hole in frontof the bushing J, and the operator takes care to match it upon theprojection j thereof.

This gages the position of the pipe. At each subsequent movement, thematching of the previously partially drilled hole upon the projection jserves to gage the place for the next operation with absolute precision.At each movement of the lever N the small drill h completes a hole, andthe larger drill is commences a new one. The machine, thus organized,drills three series of holes in right lines, at a mathematically exactangle relative to each other, and this, even if' the pipe is more thanusually crooked and irregular. It should be remarked that the shaft Band the arms B as also the treadle and its connections for operating it,should be sufficiently strong to spring the pipe temporarily into aright line during the period while it is being drilled. The bushing J jis attached to the support F and can be removed and a new onesubstituted as often as desired.

I find by practice, that a delicate drill, h, will serve a long time inthis machine, partly because it has only a little distance to bore, andpartly because the scale or hard surface is all removed from the iron bythe action of the large drill, and it finds only the soft interior ofthe iron before it to work on. The bushing J j should not touch thedrill but comes very near it and serves to protect it.

The method or process of drilling sprinkling-pipes by the machine hereindescribed has been made the subject-matter of a separate application fora patent.

partially drilled hole and determine the posif tion of the pipe, andhaving a concentric aperture adapted to "receive the drill h, as hereinspecified.-

3. The prick-punch P, mounted as shown,

in combination with the drills k and h, and theirimpelling and operatingmeans, substantially as and for the purpose herein specified.

4. The fly-wheel L, in combination with the drill k, and adapted toserve both as a means of 'steadying the drill in operation, and ofconfining and releasing it, as herein specified.

5. The combination of the supporting-rollers G, clamping-arms B lateralsupport F and drills k h, and their driving means, the

several portions serving relatively to each other as and for thepurposes herein specified. In testimony whereof I have hereunto set myhand" this 11th day of June, 1875, in the presence of two subscribingwitnesses.

FREDERICK GRINNELL.

Witnesses:

F. H. MAYNARD, F. W. HARTWELL.

